Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1111-1111 pattern in any orientation.
A146939
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1111-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =8a(8) =13a(9) =24a(10) =41a(11) =98a(12) =229a(13) =673a(14) =1711a(15) =5548a(16) =16018a(17) =61606a(18) =212821a(19) =953199a(20) =3714584a(21) =18906725a(22) =85353129a(23) =504635142a(24) =2652064148a(25) =18219772927a(26) =110274034707a(27) =872419840249
External references
- oeis: A146939